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Iodizing agent and process for preparation thereof

a technology of iodizing agent and process, applied in the field of new iodizing agent, can solve the problems of iodine loss, significant iodine loss, and rapid loss of iodine in most unrefined salt samples, and achieve the effects of reducing the cost of salt purification, preventing chemical degradation, and promoting the use of sal

Inactive Publication Date: 2006-01-05
COUNCIL OF SCI & IND RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] Another object of the present invention is to sequester the iodate anion in the iodizing agent in its matrix to prevent the chemical degradation in presence of moisture and chemical impurities such as MgCl2 in the salt.
[0015] Still another object of the present invention is to promote the use of salt containing beneficial impurities for the body while at the same time reducing cost of purification of salt and maintaining the iodizing agent in stable form.
[0017] Yet another object of the present invention is to enhance the stability of the iodate anion and protect it from direct exposure by incorporating it in the interlayer space of synthetic hydotalcite.

Problems solved by technology

Iodine was rapidly lost in most unrefined salt samples.
Further, the presence of moisture due to hygroscopic impurities, and metal ion impurities, such as iron accelerated the loss of iodine.
Moreover, significant loss of iodine is observed on boiling the salt solution or heating the iodised salt.
However, as is well known to practitioners in this field, this is not the approach followed in practice for stabilization, presumably because the results are not as encouraging as that indicated in the above report.
The authors have not given data on stability of iodine for singly fortified salt but even if it were very stable, the process of micro encapsulation is expensive.
Moreover, the high local concentration of iodine would make it difficult to guarantee uniform distribution in the product while ensuring a total iodine not exceeding 30 ppm.
The main disadvantage of this kind of compound for its use as iodising agent in the preparation of iodised salt is its high alkalinity that would make it unsuitable in pharmaceutical or food application.
Further, the concentration of iodate in this compound is too high for even distribution in edible salt.
Moreover, HTNO3 is not recommended for edible purpose.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example-1

[0049] 6 gm of hydrotalcite having molar ratio of MgO:Al2O3 equal to 6.0, XRD pattern having intensity peaks (Ao) 7.77, 3.87, 2.57, 1.53, 1.50, 1.42, and sharp IR absorption peak of interlayer carbonate ions at 1370 cm−1, was powdered to pass through 60 BSS mesh and calcined in a furnace at 500° C. for one hour. The calcined hydrotalcite was cooled to 65° C. This was added to 100 ml of 0.01M potassium iodate solution prepared in distilled water, which is heated to 70° C. prior to addition. The reacting mass was stirred for five minutes maintaining the said temperature and left to stand for one hour with intermittent stirring for one minute at an interval of 30 minute. The resultant slurry was filtered. The solid separated was washed with distilled water till the wash filtrate does not show any silver iodate precipitate with silver nitrate. The solids were dried at 110° C. The dry material was analyzed for its iodine content using classical method of iodometry employing sodium thiosu...

example-2

[0050] 6 gm of hydrotalcite having molar ratio of MgO:Al2O3 equal to 5.5, XRD pattern having intensity peaks (Ao) 7.60, 3.82, 2.57, 1.53, 1.50, 1.42, and sharp IR absorption peak of interlayer carbonate ions at 1365 cm−1, was powdered to pass through 60 BSS mesh and calcined in a furnace at 450° C. for one hour. The calcined hydrotalcite was cooled to 80° C. This was added to 50 ml of 0.005M potassium iodate solution prepared in distilled water which is heated to 80° C. prior to addition. The reacting mass was stirred for five minutes maintaining the said temperature and left to stand for one hour with intermittent stirring for one minute at an interval of 30 minute. The resultant slurry was filtered. The solid separated was washed with distilled water till the wash filtrate does not show any silver iodate precipitate with silver nitrate. The solids were dried at 110°C. The dry material was analyzed for its iodine content using classical method of iodometry employing sodium thiosulp...

example-3

[0051] 6 gm of hydrotalcite having molar ratio of MgO:Al2O3 equal to 6.0, XRD pattern having intensity peaks (Ao) 7.77, 3.87, 2.57, 1.53, 1.50, 1.42, and sharp IR absorption peak of interlayer carbonate ions at 1370 cm−1, was powdered to pass through 60 BSS mesh and calcined in a furnace at 525° C. for one hour. The calcined hydrotalcite was cooled to 60° C. This was added to 50 ml of 0.01M potassium iodate solution prepared in distilled water which is heated to 60° C. prior to addition. The reacting mass was stirred for five minutes maintaining the said temperature and left to stand for one hour with intermittent stirring for one minute at an interval of 30 minute. The resultant slurry was filtered. The solid separated was washed with 200 ml distilled water till the wash filtrate does not show any silver iodate precipitate with silver nitrate. The solids were dried at 110° C. The dry material was analyzed for its iodine content using classical method of iodometry employing sodium t...

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Abstract

A method for preparation of iodizing agent for the use in the formulation of iodised salt that offers excellent stability of iodine in iodised salt is developed and the unrefined salt iodised with this compound was tested for its stability in presence of moisture, temperature and metal salts at higher temperature. The hydrotalcite type layered compound was used to prepare such compound and part of carbonate was substituted with iodate anion. The iodising agent exhibited excellent stability of iodine in iodised salt.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a novel iodizing agent. The present invention also relates to a novel process for the preparation of the iodizing agent from Pharma grade hydrotalcite and water soluble alkali iodate by intercalating iodate anion in the interlayer space. The iodizing agent so prepared is stable and can be effectively used in the formulation of iodized salt, wherein it offers stability to iodine. BACKGROUND OF THE INVENTION [0002] Iodine is a very important trace element necessary in the biosynthesis of thyroid hormones. Iodine is required for developing and maintaining healthy body. There are well known Iodine Deficiency Disorders like Goiter and Cretinism. The edible salt is chosen as a vehicle in the provision of iodine because of its uniform consumption and availability to all segments of population independent of social or economic status. During the past twenty years, there has been a strong effort, lead by the United Nations, to io...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K33/36
CPCA61K33/14A61K33/18A61K2300/00
Inventor GHOSH, PUSHPITO KUMARMEHTA, SATISH HARIRAYCHUNAWALA, JATIN RAMESHCHANDRASHETH, MRUNALBEN VINODRAYGANDHI, MAHESH RAMNIKLAL
Owner COUNCIL OF SCI & IND RES
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